Merge pull request #22421 from mattermost/MM-51019-add-feature-flag-for-in-product-expansion

* Add SelfHostedExpansion config/ff.

model/config.go

@@ -385,6 +385,7 @@ type ServiceSettings struct {
 	EnableCustomGroups                                *bool   `access:"site_users_and_teams"`
 	SelfHostedPurchase                                *bool   `access:"write_restrictable,cloud_restrictable"`
 	AllowSyncedDrafts                                 *bool   `access:"site_posts"`
+	SelfHostedExpansion                               *bool   `access:"write_restrictable,cloud_restrictable"`
 }
 
 func (s *ServiceSettings) SetDefaults(isUpdate bool) {
@@ -857,6 +858,10 @@ func (s *ServiceSettings) SetDefaults(isUpdate bool) {
 	if s.SelfHostedPurchase == nil {
 		s.SelfHostedPurchase = NewBool(true)
 	}
+
+	if s.SelfHostedExpansion == nil {
+		s.SelfHostedExpansion = NewBool(false)
+	}
 }
 
 type ClusterSettings struct {